#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<vector>
using namespace std;
class Solution {
public:
    int uniquePaths(int m, int n) {
        vector<vector<int>> as(m + 1, vector<int>(n + 1));
        as[0][1] = 1;
        for (int i = 1; i <= m; i++)
        {
            for (int j = 1; j <= n; j++)
            {
                as[i][j] = as[i - 1][j] + as[i][j - 1];
            }
        }
        return as[m][n];
    }
};